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      05-11-2012, 09:22 PM   #13
Brane Khaos
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Drives: 2010 e90 / 2004 e46
Join Date: Jun 2011
Location: Driver's Seat

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I'm not exactly sure, but to answer the OP's question, I think Alpine made the professional hifi system in the e90. Below is a pic from one I ran across on eBay.

Harmon Kardon made the premium sound system (the step above the professional hi-fi). If I understand correctly Logic 7 is the DSP technology that Harmon used and in the early e90's (06-10) BMW marketed it as Logic 7 insted of Harmon Kardon. Same diff although I guess the technology in the newer units might sound better.
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